Method of erecting suspended scaffolding at construction field and scaffolding erected thereby

ABSTRACT

A suspended scaffolding used at the construction field of a multistoried building. The scaffolding can be easily erected and disassembled due to the simple combination of wire ropes and horizontal and lateral rods. The scaffolding does not occupy a large space for erection and the vertical distance between the horizontal rods can be easily varied.

United States Patent Kikuchi [45] Oct. 24, 1972 [54] METHOD OF ERECTING SUSPENDED [56] References Cited SCAFFOLDING AT CONSTRUCTION FIELD AND SCAFFOLDING ERECTED UNITED STATES PATENTS THEREBY 1,484,480 2/ 1924 Donaggio 1 82/150 [72] Inventor: Reizo Kikuchi 73 Am Takamatsu 1,506,114 8/1924 Donaggxo ..l82/l50 Haranomachioda a a Sendai, 1 Johnston l Ja 3,603,428 9/1971 l-lanses ..182/128 P Filed! p 1971 Primary Examiner-Reinaldo P. Machado No: Attorney-Kari FIOCkS [57] ABSTRACT [30] Foreign Application Priority Data v A suspended scaffolding used at the construction field July 3, 197i Japan ..46/5Q840 f a multistoried building The fi ]di can be easi- July 3, 1971 Japan ..46/58202 1 erected and disassembled due to the simple July 3, 1971 Japan ..46/58203 bination of wire ropes and horizontal and lateral rods The scaffolding does not occupy a large space for [52] US. Cl. ..182/150 erection and the vertical distance between the [51] Int. Cl ..E04g 3/10 horizontal rods can be easily varied [58] Field of Search ..l82/l50, 142, 14-3, 144, 229

2 Claims, 6 Drawing Figures PATENTEUBNQMM -3,700'071 SHEET20F2 METHOD OF ERECTING SUSPENDED SCAFFOLDING AT CONSTRUCTION FIELD AND SCAFFOLDING ERECTED TI-IEREBY BACKGROUND OF THE INVENTION 1 Field of the Invention This invention relates to a scaffolding used at the construction field of a multistoried building or the like.

2. Description of the Prior Art Conventional scaffoldings have been erected by successively assembling means such as pipes vertically from the ground level along the exterior of a building. With such a method, the maximum height of the scaffolding has been limited to about 30 meters and it has been considered extremely difficult or impossible to erect a scaffolding higher than the above limit. According to the conventional method, further, it has been required to set up the scaffolding even at unnecessary portions from the viewpoint of a balance in the total weight of the scaffolding, and once the scaffolding has been erected, it has been quite difficult to remove such portions which will abstruct the construction of the building.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the defects encountered with the conventional method.

According to the basic idea of the present invention, a plurality of brackets units spaced apart by an equal distance of the other of, for example 3 meters are fastened by means such as U-bolts to the top beams of the structure of a multistoried building under construction so as to project by a length of the order of 1 meter from the end edge of the top beams, each bracket unit being provided with an anchoring ring adjacent to the inner end thereof and having at least two horizontally spaced pulleys mounted on the projecting end portion thereof. Two wire ropes are anchored at one end thereof to the ring and extend downward while engaging the respective pulleys, and a plurality of vertically equally spaced hook means are adjustably secured to each wire rope in such a manner that a hook means on one of the wire ropes is situated at the same level as that of a corresponding hook means on the other wire rope. Horizontal pipes or rods engage the hook means on the outer and inner groups of the wire ropes respectively, and a plurality of pairs of lateral rods bridge transversely across the horizontal pipes or rods for sup porting footboard on each pair.

The above and other objects, features and advantages of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS arrange- FIG. 5 is an enlarged perspective view showing another means for fixing the horizontal rod to the wire rope.

FIG. 6 is a schematic side elevational view showing the scaffolding suspended from the top of a multistoried building.

DESCRIPTION OF THE PREFERRED EMBODIMENT Refen'ing now to the drawings, a scaffolding embodying the present invention includes a plurality of substantially equally spaced bracket units 3 which are arranged in a manner as shown in FIG. 2 and are fastened by means such as U-bolts to the top beams I of the steel structure of a multistoried building under construction so as to suitably project from the end edge of the top beams 1. Each bracket unit 3 carries a plurality of pulleys 2 as shown in FIG. 1. An anchoring ring 4 is fixed to the bracket unit 3 adjacent to the inner end thereof, and two wire ropes 5 are anchored at one end thereof to the anchoring ring 4 and extend downward while engaging the, pulleys 2 in the manner shown in FIG. 1. A plurality of vertically equally spaced hook means 6 or 6 are detachably and adjustably secured to each wire rope 5 in such a manner that a hook means 6 or 6 on one of the wire ropes 5 is situated at the same level as that of a correspondinghook means 6 or 6' on the other wire rope 5. Horizontal pipes or rods 7 are engaged by the hook means 6 or 6 on the outer and inner groups of the wire ropes 5 respectively to run in parallel with each other as shown in FIG. 1, and a plurality of pairs of suitably spaced lateral rods 8 bridge transversely across and engage the horizontal rods 7 to maintain the horizontal rods 7 in parallel position A pair of spaced footboard supporting rods engage each pair of the lateral rods 8 for supporting a footboard 9 thereon as shown in FIG. 1. A plurality of bracing rods 10 are fixed at one end thereof to the steel structure or suitable means at the ground level and engage at the other end thereof with the horizontal rods and with the lower end of the wire ropes 5 so as to stabilize the scaffolding against undesirable swinging movement.

Referring to FIG. 4, the hook means 6-comprises a generally U-shaped member 12 which is formed with a plurality of inwardly extending thorn-like projections 11 so as to engage firmly with the wire rope 5. The U- shaped member 12 is provided with a finger 13 which is received in the opening of an annular end portion 14 of a hook 16 for suspending the hook 16 from the supporting member 12. The hook 16 is also formed with a plurality of inwardly extending thorn-like projections 15 at the curved lower end portion thereof so as to engage firmly with the horizontal pipe or rod 7. In this manner, the hook means 6 can be secured detachably and adjustably to the wire rope 5.

Referring to FIG. 5, the hook means 6' comprises a pair of generally arcuate members 19 and 19' for securely holding the horizontal pipe or rod 7 therebetween. The generally arcuate members 19 and 19 are shaped in the form of a small are at portions 20 and 20 of the upper and lower flanges and a plurality of inwardly extending thorn-like projections and formed on the inner surface of these portions 20 and 20' so as to firmly hold the wire rope'5 therebetween. A connecting means such as a ring 17 connects the arcuate members 19 and 19 to each other, and a butterfly nut 18 engaging a bolt is used to firmly fasten the arcuate members 19 and 19' together. In this manner, the horizontal pipe or rod 7 can be secured to the wire rope 5. It will be understood that the hook means 6 and 6' can be simply detached and mounted as required and the vertical spacing therebetween can be easily adjusted, while unnecessary ones can be easily removed. Lamps 21 may be suspended from some of the bracket units 8 when so required.

The suspended scaffolding having such a structure is fixed in place by connecting and fixing the horizontal pipes or rods 7 and the lower end of the wire ropes to the bracing rods 10 disposed at a plurality of levels. The suspended scaffolding according to the present invention is advantageous in that it can be safely and quickly erected with a leact requirement for the materials even in a quite limited space as in an area where thehouses stand close together. Further, clue to the fact that the horizontal pipes or rods can be easily disengaged from the hook means on the wire ropes, a part of the horizontal pipes or rods can be removed during construction work so as not to obstruct the construction work. Furthermore, required exterior finish work on a multistoried building can be carried out whenever and wherever so requireddue to the fact that the scaffolding can be easily erected by merely suspending the wire ropes from the bracket units secured to the top beams of the steel structure without requiring erection from the ground level. This advantage becomes more marked with the increase in the height of the building.

Further, a plurality of such scaffolding may be suspended on all sides of the building thereby increasing the efficiency of the construction work to several hundred times the efficiency of the prior art construction work. Therefore, several hundred workers can simultaneously carry out individual works at their working spots, and the period of time for constructing the building can be remarkably shortened thereby remarkably reducing the costs. Lower costs are required compared with the costs required heretofore for constructing a multisotried building and this merit becomes more marked with the increase in the height of the building.

A pulley may be suspended from the braket unit 3 for the purpose of lifting the construction materials, and the electric lamps 21 may be utilized as safety lamps for ensuring the safty of the construction work. After building is completed, the bracket units may be left in the projected position so as to be utilized for suspending a gondola for cleaning and repairing the outer walls of the building, wiping the windows, and any other works. The electric lamps may be used to illuminate the building or as a means for preventing intrusion of burglars.

It will be understood from the foregoing description that the present invention provides a suspended scaffolding which can be easily, safely and rapidlyerected at any desired level of a multistoried building regardless of the space available at the ground level and with a least requirement for the materials, costs and labor. The suspended scaffolding according to the present invention does not obstruct the construction work since a part thereof can be easily be removed. Thus the present I claim:

1. A method of erecting a suspended scaffolding at the construction field of a multistoried building comprising securing a plurality of substantially equally spaced suspending means to the top beams of the steel structure of the multistoried building under construction, each said suspending means projecting suitably from the end edge of the top beams and having at least two horizontally spaced pulleys mounted on the projecting portion thereof, fixing one end of two wire ropes to an anchoring means provided adjacent to the inner end of each said suspending means, suspending said wire ropes downwardly while engaging same with said pulleys respectively, fixing the lower end of said wire ropes to another anchoring means disposed at the ground level or a suitable level above the ground level, securing a plurality of vertically substantially equally spaced hook means to said wire ropes in such a manner that a hook means on the inner one of said wire ropes is situated at the same level as that of a corresponding hook means on the outer one of said wire ropes, engaging a pair of horizontal rods with the hook means of the same level on the outer and inner groups of said wire ropes respectively, bridging a plurality of pairs of suitably equally spaced lateraLrods transversely across said horizontal rods and securing same to said horizontal rods, bridging a pair of footboard supporting rods transversely across each pair of said lateral rods and securing same to said lateral rods for supporting a foot board thereon, and fixing some of said horizontal rods to bracing means at a plurality of levels for preventing swinging movement of the scaffolding.

2. A suspended scaffolding erected at the construction field of a multistoried building comprising a plurality of substantially equally spaced suspending means secured to the top beams of the steel structure of the multistoried building under construction so as to project suitably from the end edge of the tope beams, each said suspending means being provided with an anchoring means adjacent to the inner end thereof and having at least two horizontally spaced pulleys mounted on the projecting portion thereof, two wire ropes fixed at one end thereof to said anchoring means and suspended downwardly while engaging with said pulleys respectively, another anchoring means disposed at a suitable level for fixing the lower end of said wire ropes, a plurality of vertically substantially equally spaced hook means secured to said wire ropes in such a manner that a hook means on the inner one of said wire ropes is situated at the same level as that of a corresponding hook means on the outer one of said wire ropes, a pair of horizontal rods engaging with the hook means of the same level on the outer and inner groups of said wire ropes respectively, a plurality of pairs of substantially suitably spaced lateral rods bridging transversely across said horizontal rods and secured to the latter, a pair of footboard supporting rods bridging transversely across each pair of said lateral rods and secured to the latter, and bracing means disposed at a plurality of levels and engaging with said horizontal rods for preventing swinging movement of the scaffolding. 

1. A method of erecting a suspended scaffolding at the construction field of a multistoried building comprising securing a plurality of substantially equally spaced suspending means to the top beams of the steel structure of the multistoried building under construction, each said suspending means projecting suitably from the end edge of the top beams and having at least two horizontally spaced pulleys mounted on the projecting portion thereof, fixing one end of two wire ropes to an anchoring means provided adjacent to the inner end of each said suspending means, suspending said wire ropes downwardly while engaging same with said pulleys respectively, fixing the lower end of said wire ropes to another anchoring means disposed at the ground level or a suitable level above the ground level, securing a plurality of vertically substantially equally spaced hook means to said wire ropes in such a manner that a hook means on the inner one of said wire ropes is situated at the same level as that of a corresponding hook means on the outer one of said wire ropes, engaging a pair of horizontal rods with the hook means of the same level on the outer and inner groups of said wire ropes respectively, bridging a plurality of pairs of suitably equally spaced lateral rods transversely across said horizontal rods and seCuring same to said horizontal rods, bridging a pair of footboard supporting rods transversely across each pair of said lateral rods and securing same to said lateral rods for supporting a footboard thereon, and fixing some of said horizontal rods to bracing means at a plurality of levels for preventing swinging movement of the scaffolding.
 2. A suspended scaffolding erected at the construction field of a multistoried building comprising a plurality of substantially equally spaced suspending means secured to the top beams of the steel structure of the multistoried building under construction so as to project suitably from the end edge of the tope beams, each said suspending means being provided with an anchoring means adjacent to the inner end thereof and having at least two horizontally spaced pulleys mounted on the projecting portion thereof, two wire ropes fixed at one end thereof to said anchoring means and suspended downwardly while engaging with said pulleys respectively, another anchoring means disposed at a suitable level for fixing the lower end of said wire ropes, a plurality of vertically substantially equally spaced hook means secured to said wire ropes in such a manner that a hook means on the inner one of said wire ropes is situated at the same level as that of a corresponding hook means on the outer one of said wire ropes, a pair of horizontal rods engaging with the hook means of the same level on the outer and inner groups of said wire ropes respectively, a plurality of pairs of substantially suitably spaced lateral rods bridging transversely across said horizontal rods and secured to the latter, a pair of footboard supporting rods bridging transversely across each pair of said lateral rods and secured to the latter, and bracing means disposed at a plurality of levels and engaging with said horizontal rods for preventing swinging movement of the scaffolding. 